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- W2024231836 abstract "Abstract Incubation of Calliobothrium verticillatum in salt solutions showed that the worms change in wet weight as a function of the salt content of the medium and that chloride is gained or lost depending on the concentration in the medium. Evidence is presented to show that the addition of urea to salt solutions prevents an initial imbibition of water observed in all salt solutions used. Similar data were obtained with Anthobothrium and Inermiphyllidium. It was shown that the blood and spiral valve fluids of the hosts and freshly collected worms have a high content of urea. In Calliobothrium, urea makes up 3.7% of the dry weight of the animal. Urea is lost from the worm on incubation in urea-free media and the concentration in the worm is a function of the concentration of urea in incubation media. There is an inverse relationship of tissue chloride in the worm and concentration of urea in incubation media. Permeability of the worms to urea and water is affected by deletion of calcium from salt solutions in which they are incubated. Tetrabothrius erostris and Hymenolepis diminuta undergo irreversible hydration when urea is added to salt solutions which are isosmotic. The trematodes, Cryptocotyle, Himasthla, Zoogonoides, Lepocreadium and Lecithaster and the turbellarians, Planocera and Hoploplana, are immobilized by the addition of urea to salt solutions in which these worms normally remain active for considerable periods. Bdelloura, a symbiotic triclad, was not affected by addition of urea to sea water. The data are discussed in terms of the possible special roles of urea in the biology of tetraphyllideans and as a barrier to the exploitation of elasmobranchs as habitats by other helminths." @default.
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- W2024231836 title "Urea and osmotic properties of tapeworms from elasmobranchs" @default.
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- W2024231836 doi "https://doi.org/10.1016/0014-4894(59)90008-6" @default.
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